Precession vortex flowmeter manufacturers inaccurate reasons
Precession vortex flowmeter may have inaccurate phenomenon when used, how is this?
1, the influence of vortex generating body onstream surface accumulation of vortex flowmeter
If there are viscous particles in the measured flow body, they may gradually accumulate on the flow surface of the vortex generating body, so that its geometry and size change, and therefore the flow coefficient changes accordingly, so pay attention to cleaning up in use.
2, the impact of temperature on measurement
The influence of temperature change on the geometry of the measuring body is composed of two parts, one is caused by the change of the width of the vortex generating body; The other is caused by a change in the inner diameter of the pipe. To eliminate this effect, the K coefficient is generally modified. At present, some manufacturers’ flowmeters have carried out fixed temperature correction and real-time temperature correction on the influence of temperature in the software.
3. The influence caused by the inconsistency between the inner diameter of the tube and the inner diameter of the flow meter;
4, the selection of problems
The actual selection should be as small as possible to improve the measurement accuracy, for example, a vortex pipeline is designed to be used by several equipment, because the process part of the equipment is sometimes not used, resulting in the current actual use of the flow is reduced, the actual use of the original design selection caliber is too large, which is equivalent to increasing the lower limit of measurable flow, the indication of small flow of the process pipeline cannot be guaranteed. It can also be used when the traffic is heavy, because it is sometimes too difficult to rebuild. Changes in process conditions are only temporary. It can be combined with parameter retuning to improve indicator accuracy.
